Razor-blade-sharpening apparatus



Oct. 27, 1925. 1,558,990

E. LEIMBERG RAZOR BLADE SHARPENING APPARATUS Filed Jan 15, 1925 Patented Oct. 27, 1925.

EWALD LEIMIBfEdEtGr, OIE BERLIN, GERMANY.

RAZOR-BLADE-SHABPENING APPARATUS.

Application filed January 15, 1925. Serial No. 2,630.

T all whom it may 0072061 114 I Be it known that I, EwALD LEIM ERG, a citizen of the German Republic, and resident of Berlin, Germany, have invented a new 5 and useful Improved Razor-Blade-Sharpening Apparatus, for which I have filed application for a patent in Germany on August 9 1923,-and ofwhich the following" is a specification. 10 ldy invention relates to an apparatus for grinding and honing razor-blades ofthe ,kind which can be ground and honed at each of its two longitudinal edges and on both sides of each edge, first the grinding and 'then the honing; being eii'ected successively at all four shaving edges. .More especially my invention relates to grind ing and honingapparatus of the kind mentioned in which the blade is to be attached .to a holder carried at each end in a supporting member secured to the free ends of a U-shaped operating member which is reciprocated in a. frame' or casing carrying on its bottom an'obliquely arranged and exchangeable grinding body, or honing body respectively. over .which the blade-holder 'with the blade is moved to and fro parallelly to itself. the holder with he blade being); caused to rotate practically for 90 at the end of every path and the direction :of the successive partial rotations being always the same so that the two edges are. around. or honed respectively, in continuous alternation and on both sides of each edge. There are in such an apparatus. of course,

means for eiiectinsr the successive part-rotations, and mv invention relates to thesemeans. In the known apparatus mentioned,

holder is provided atone end with two projections extending in opposite directions.

parallelly to-the breadth of the blade, and with two other projections extending at. right-angles theretoand cooperating; with a 'sprinm or 'an equivalenttherefor. by whichv rigid ledo'e which is subject to the action of" {separatesprings provided its ends eX-,

as well as'in my improved one; the blade-v etr'ected'by a stationary ledge-like guide.

tends along parallelly to the first-mentioned guide-ledge and is lifted a little vertically alternately by one and the other of the before mentioned projections, of which has been explained that they co-operate with a spring.

Now, in contradistinction to said known arrangement and combination of parts, as regards the spring and the parts co-operating therewith, the spring etc. are-, in improved apparatus combined with s the ,bla de h0lder and travel with it along to'and fro, whereby the advantage is obtained that the pressure with which the shavingsedege to ;be ground and honed is pressed onto the respective body is always the same, oruniform respectively, whereasit is non-uniform in the known apparatus so that the shavingedges are not uniformly ground andhoned along the entire length of each side of each edge.

Another drawback of the known apparatus mentioned consists therein that the longitudinally extending spring, or its equivalent, and the blade-holder projectionscooperating therewith et di sengap;ed. in that said spring etc. glides ofl' laterally from the respective proiections whereby the apparatus is rendered inoperative at least for the time being. The owner is. however, not always able to replace himself the spring into its proper position.

Tn the whole. the improved apparatus is simpler and more reliable in action. and'its operativenparts are more easily accessible so that it is also more easily possible'to remove inaccuracies that may arise in the guide-means or in the means for turning the blade-holder with the blade successively for about 90,as described. s

My invention is illustrated by way. of example in the accompanying drawing in which Figure 1 is a perspectiveillustration of the complete apparatus; Figure 1 is a vertical cross-section through the casino, opposite the end' of the blade-holder. (d), and FiKZHYGS 3. 4. and 5. are illustrations of theparts located within the casing at the 'top of Fig. 1 (rear end of inner side of ap-- paratus on the left) and show various positions of these parts while the bladeholder with the blade is moved once to and fro The casing a which is practically U- shaped in cross section carries on its bottom-- the grindingbody a, or the honingbody respectively, which is arranged obliquely in known manner, as shown (Fig. l). The upper rims of the sides of the casing are bent round so as to form guides for a U-shaped slide 6 which consists preferably of wire and the free middle part of which serves as handle for operating the apparatus. To the end of each leg of the slide 6 is secured a downwardly extending member 0 which serves as bearing for an end of the bladeholder (Z. The two ends of the blade-holder are diflferently long, The longer end carries the two. projections, or, more precisely, the two pairs of projections, mentioned in the preamble, 6 denotes one of these pairs, f the other. e is formed by a small ledge ex tending parallelly to the blade 0 which is attached in known manner to the holder (Z, and f is formed by two bent ledges which are so shaped and connected with each other as to represent a rhomb, The long axis of the latter extends at right angles to the pair of projections 0. i

The rhomb f co-operates with a platespring 9, or, more precisely, the four sides of the rhomb co-operate successively with said spring, which is held in place by. two spiral springs hh, either of which is con nected at its upper end with one end of the plate-spring g and at its lower end with one of two lugs 7c is forming parts of longitudinal projections of the respective bearing for the respective end of the bladeholder (Z. Below the just described parts commences a ledge 2' which is provided with a curved projection 2" at. this endand extends in the direction to the handle-part of the slide Z). The ledge 2' is firmly attached to the bottom of the casing. Near its front end, between this latter and the lefthand sidewall of the casing, is an oblique projection j, which co operates with the rhomb f, whereas the projection z" the ledge co-opei'at'es with the pair of projections e.

1 and 2 denote the shaving edges of the blade.

, The manner of operation of the apparatus is as follows:

Supposing, a blade 0 be,attached to the holder d, and the slide 1) drawn in the. dimotion to the front of the casing, then that projection e which is the lower at the time being will push upon the oblique rear edge at the end of the ledge z and will be turned thereby v'vhen gliding upwards on it, whereby also the rhomb f is turned and the springs g, h and h are putunder tension. At the same time the blade-holder with. the blade is so turned as to assume an oblique position. When the projection e in question has arrived on the top of the projection i of the ledge i, that edge which is the lower one at the'tiine being is jiis tbver the rear end of the sharpening body a1, and when said pro jection 6 gets down upon the ledge while the slide is further drawn forwards together with the parts connected with it, the bladeedge mentioned gets down upon the body a and is now drawn along over this body so that .e'very part of the edge in question is subjected to the action of that body.

lVhen the blade-edge has arrived over the end of the sharpening body a, the projection a has arrived at the projection 7', con tacts therewith, and is turned by it, so that also the blade-holder is turned and the blade-edge is lifted off the body (4, hen now the Slide Z) is drawn rearwards still a little more, the projection c is retained by the projection 7' and the rhomb f is turned from the position shown in F ig. 3 into the position shown in F ig. 4. Fig. 3 shows the parts in that position which they occupy when the lower projection has just left the projection z" of the ledge 2'. They re main in this position until the ,rhomb f is being turned by the projection Figure & shows the parts concerned already moved away a little from the projection, 7', viz on their way back tothe rear end of the casing. When the rhomb has been turned in the manner described, the two projections e have changed their position, the formerly lower one being now the upper one, and the parts remain now in this position while they are moved towards the rear end of the apparatus. The now lower projection 8; having arrived at the projection z" of the ledge i glides upon the projection whereby the three springs are again put under tension and the blade holder is so turned that the blade-edgejs lifted off the sharpening body (4 Immediately thereafter the projection e in question. gets upon the sloping end edge of the ledge 2', in consequence whereof the rhombj is turned for another quarter of a circle, but owing to the inertia of the quickly moving parts, the blade-holder with the bladesassumes the position shown in Fig. 5, which is no other position than the initial position shown in Fig. 2, the only difference being that now (Fig. 5) the blade-edge 2 is the lower edge of the blade whereas in Fig. 2 itis the upper one. The slide 7) is then again drawn out of its guideways so that the motions occurring during its path are repeated, and when the rhomb f hasbeen turned for theseoond time, (by the projection 7', the first turning having been 'eflec't'ed by the projection z"), the slide is moved again back in the opposite direction, and the movable parts in general and the blade in particular are reciprocated in this way until first the grinding and then the honing has been completed, the grinding body being exchanged for the honing body as soon as the grinding has been done. 7

It is obvious that the pressure with which the blade-edge is pressed onto the body a is always the same, i. e. uniform, and that it is out of the question that the rhomb f and flat spring g can ever come out of contact.

I claim:

1. In an apparatus for sharpening razorblades at both edges and at both sides of each edge, in combination 1 a slide adapted to be reciprocated in a casing; blade-holder bearings at the free ends of said slide, and a blade-holder supported in said bearings; two-pairs of projections arranged at right angles to one another and attached to said blade-holder at one end thereof; a platespring carried by the bearing adjacent to said projections and arranged to cooperate with one of said pairs of projections; a guide-ledge on the bottom of said casing, and a stationary projection near the outer end of said ledge and adapted to co-operate with the other pairs of projections, substantially as set forth.

2. In an apparatus for sharpening razorblades at both edges and at both sides of each edge, in combination: a slide adaptedv to be reciprocated in a casing; bladeholder bearings at the free ends of said slide, and a blade-holder supported in said bearings; two pairs of projections arranged at right angles to one another and attached to said blade-holder at one end thereof; a plate-spring carried by the bearing adjacent to said projections and arranged to cooperate with one of said pairs of projections and bearing on one of these latter; two spiralsprings connected at one end with the ends of said plate spring and at the other end with said latter bearing; a guide-ledge on the bottom of said casing, and a stationary projection near the outer end of said ledge and adapted to co-operate with the other pair of projections, substantially as set forth.

'In witness whereof I have hereunto set my hand.

EWALD LEIMIBERG. 

